Milling-machine



(No Model.)

J. A. GREGG.

MILLING MAGHINE.

No. 890,184. Patented Sept. 25, 1888.

@X-vvaerg: XN'Q 1x16? ga n kowvm a rr's JOHN A. GREGG, OF BAY CITY,MICHIGAN, .ASSIGNOR TO AMOS S. PARKE, OF SAME PLACE, AND SYLVANIS S.MITTS AND XVILLIAM MERRILL, BOTH OF EAST SAGINAW, MICHIGAN.

MILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 390,164, datedSeptember 25, 1888.

Application filed December 31, 1887. Serial No. 259.463. (No model.)

To all whom it may concern:

Be it known that I, JOHN A. GREGG, a citizen of the United States,residing at Bay City, in the county of Bay and State of Michigan,

haveinvented certain new and useful Improvements in Milling-Machines;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

My invention relates to improvements in i5 milling-machines, andespecially to the feeding devices which are designed for carrying thecutter forward to the work or the work to the cutter; and the inventionis particularly adapted for light worksuoh as milling the ends ofband-saws, bolt-heads, nuts, Ste-and for feeding other light machinesrequiring a slow and positive feeding movement.

The invention consists, chiefly, in the combination, arrangement, andconstruction of the devices employed, as I hereinafter set forth morefully, and especially point out in the claims.

One of the objects of my invention is to provide a cheaper and moreeasily constructed 3;: and more simple machine for milling and a machinewhich requires no skilled workman to adjust and operate.

A second object of my invention is to provide feeding devices formilling and other machines requiring slow and positive feed move ments,which will operate to feed the tool forward at the required slow speedand will permit the cutter to be moved back ward ata much greater speedwithout extra mechanism.

I attain these objects by means of the devices illustrated iu-theaccompanying drawings, in which- Figure 1 is an end view, in elevation,of a milling-machine for scarfing the ends of band- 5 saws and with myimprovement embodied therein. Fig. 2 is a front view of the upperportion of the same. Fig. 3 is a top or plan view of the same. Fig. 4 isa view of the rear side of the table and showing the mode of attachingthe same to the machine. Fig. 5 is a longitudinal section of thefeeding-nut. Fig. 6 is a view of the screw clamping device detached.

a represents a base-plate, which is secured to and supported by acolumn, I), and is provided in its upper surface with a groove, 0,having the edges of the groove of a dovetail form, and d is a carriagefitted into the groove 0 and provided with edges fitting the edges ofthe groove.

Upon the upper portion of the carriage d and transversely with thegroove 0 is arranged a raised portion or box, a, longitudinally throughwhich is passed the arborf, and just outside of one end of the box 6 isplaced a rotary cutter, g, and upon the arbor, at the opposite end ofthe box, is mounted a wormwheel, h, and upon the other end of the arboris mounted and secured a pulley, i, to which motion is to he imparted bya belt driven by some suitable motor; or in place of the pulley 13 acrank may be substituted and the cutterarbor actuated by hand-power.

Lengthwise of the bed-piece a, and upon the front side thereof andbeneath the worm-wheel h, is placed a screw, j, the ends of the screwbeing j ournaled into thebrackets kancll,which are bolted to the ends ofthe bed-plate a, and one of thejournals m, extending beyond the bracketZ, is provided with a square portion, upon which a crank, it, issecured, and the bracket Z is provided with a cap piece, 0, throughwhich and through the bracket is passed a bolt provided with alever-nut, p, for holding the cap in position and for tightening the capupon thejournal, which prevents a retary motion of the screw j whendesired.

(1 is a nut of eylindrical form having a eentral opening through itslength and provided with a screw-thread and passed upon thescrew 0 j andengaging with the screw-thread thereon, and upon the central portion ofthe nut is arranged a woi'mgear, r, the teeth of which i11- termesh withthe thread 011 the worm-wheel h, the not being located beneath thewormwheel and secured in position by the brackets s s, which are securedupon each side of the box 0, and have their outer ends provided withopenings,through which passes the screw j, and the brackets then restagainst the oppo- I03 site ends of the nut and allow a free rotarymovement of the nut, but prevent any movement endwise thereof inrelation to the wormwheel and the cutterarbor in either direction.

Upon the side of the machine opposite the screwy is placed a bed ortable, 1, the table being somewhat inclined and provided with an apronor vertical portion, a, resting against the side of the column I), andsecured thereto by bolts 1), which pass through slots w, formed in theapron and into the column.

Below the apron are arranged the lugs m, projecting outwardly from thecolumn, and the screws 3 are passed through the lugs and have their endsresting against the lower edge of the apron,which provides a means ofaccu rate vertical adjustment of the table t relative to the cutter 1and one or more set-screws, :J, are passed through the apron, and withtheir inner ends bearing against the column furnish a tilting adjustmentof the table and give more or less incline to the table, as desired.

The operation of the devices is as follows: Power being applied torevolve the arbor in the required direction, (which in this case is inthe direction indicated by the arrow in Fig. 2,) the worm-wheel hrevolves with the arbor, and engaging with the worm gear-wheel 1eperates to revolve the nut q, and the nut engaging with the thread uponthe screw j revolves the screw when the journals thereof are free and nomeans are applied to prevent the screw from revolution; but when thescrew 1) is tightened and the cappiece closed upon the journal m thescrew is then held rigid,and the nut gtheu revolves upon the screw andthe carriage d, and cutterg is forced forward toward its work, and theforward movement thereof is arrested by releasing the bolt 5 and freeingthe screw from detention. The screw then revolves,and the forwardmovement of the carriage and the cutter is stopped.

The carriage maybe moved in either direc tion very rapidly by operatingthe crank n to revolve the screw j, so that when the scrcwp is tightenedand the earriageis forced forward until the cutter has passed over thework the screw 1) is then loosened and the screw j is revolved by thecrank it to quickly return the carriage to its original positionpreparatory to making another cut.

The inachine,asherein shown and described, is arranged for milling theends of band-saws and forming thereon suitable beveled surfaces, which,when lapped upon and brazed to each other, form atruc and even joiningof the plate, and the operation is that the saw plate is clamped uponthe table 1; by a bar, a, and screws b, and the table, being somewhatinclined in relation to the cutter, places the saw at an angle with thecutter, the angle being slightly changed, if desired, by the setscrewsc, and the height of the plate is adjusted in relation to the cutter bythe serewsg to form the desired width of bevel upon the plate, the screwj being operated by the crank it to bring the carriage and the cutter tothe proper position'at one edge of the clamped plate. The screw p isthen tightened and the screw j held rigid. The revolving cutter thenmoves for ward and passes over the end of the saw-plate presentedthereto and forms the required bevel thereon.

The cap 0 and screw 11 are herein shown as a means of clamping thejournal m for holding the sercwj rigid in its bearings; but I do notconfine my invention entirely to this special arrangement, as variousdevices can be applied for retaining the screw against rcvolntion; noris the location and securing of the several devices and elements at allessential to the working and operation of the device, as the severalparts may be located in other po sitions and operate with equalperfection and with the same result.

The advantages gained by this machine are that the working parts are fewand its construction simple, and it is easily operated or adjusted by anunskilled workman, and the feeding device forms a cheap and effectivemovement for various machines which require a slow and positive feed.

Having fully described my improvement, whatI claim as my inventiou,anddesire to secure by Letters Patent, is-

1. In a milling-machine, the combination, with the base-plate providedwith a longitudinal groove having overhanging edges, a car riage fittedinto the groove and provided with a raised box lying at right angleswith the groove, a cutter-arbor journaled in the said box and carrying arotary cutter anda wornr wheel, and a feeding-screwplaccd at rightangles with the said cutter-arbor and journaled at its ends insupportirig-brackets, of a cylindrical nut provided with a threadedcentral longitudinal opening and passed upon the said screw, and havingon its periphery wormgear teeth engaging with the said worm-wheel uponthe arbor, and retained. in position by brackets, as s, projecting fromthe said carriage, substantially as and for the purpose set forth.

2. In a miHing-machine, the combination, with a cutter-arbor journalcdupon a suitable carriage and provided with a worm-wheel, of acylindrical nut secured below the said arbor and having through thecenter of its length a threaded opening and provided on its peripherywith worm-gear teeth engaging withthe thread of the said worm-wheel, anda feedingserew passed through. the said threaded opening of the nut andjournalcd by its ends to supporting-pieces extending from the machinebed-piece, substantially as and for the purpose set forth.

In a milling-machine, in combination, the base-plate a,suitablysupported and provided with a groove, 0, a carriage, (Z, fitted into thegroove, an arbor, f, journaled upon the said carriage and carrying arotary cutter and a worm-whcel, 7:, the nut q, provided with a centralopening having a screwthread and having on its periphery worm-gear teethen gaging with the worm-wheel 7t, the brackets s 8 upon each side of thenut and secured to the carriage, afeeding-screw, j, passed through thesaid opening in the nut, the brackets is and Z,secu red to opposite endsof the bed-plate and carrying the screw, and devices, as the cap-piece 0and screw 12, for retaining said feeding-screw against revolution,substantially as and for the purpose set forth.

4. In a milling-machine, the combination, with a baseplate, a, providedwith a groove, 0, the carriage d, fitted into the groove and carrying acutter-arbor and rotary cutter, a wormwheel, it, upon the arbor, acylindrical nut provided with a threaded central opening,and afeeding-screw, j, passed through and engaging with the nut q andjournaled to supportingbrackets, of a table, t, provided with a verticalapron, at, having vertical slots 10, and secured to the columnby thebolts 1;, passed through 20 in the apron and against the column,substan- 25 tially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN A. GREGG. Witnesses:

W. H. POWER, J AS. E. THOMAS.

